Inside casing cutter



I l9Z9.' EVE-NTRESCA 1,739,932"- INS IDE CASING CUTTER Original Filed-My18, 1925 Patent Dec, 17, 1929 u STATES ERCOLE VENTRESCA, OF HOUSTON,TEXAS INSIDE CASING CUTTER Application filed May 18, 1925, Serial No.31,005. Renewed August 8, 1927.

The present invention relates, to a casing cutter, such as would beuseful in wells,'and has for its principal object to provide a structurewhich may be efliciently operated for cutting thecasing from the inside,as is frequently most desirable.

Another important object of the invention is to provide a cutter of thisnature, which may be operated by air or water, and has a structurewhereby the air and water will be fed to the cutter to form a coolingmedium which will also wash away the cuttings.

A still further object of the invention is to provide a cutter of thisnature, which is exceedingly simple in construction, strong,

durable, easy to manipulate, efficient and reliable in operation, notlikely to easily become out of order, and otherwise well adapted for thepurpose for which. it is designed.

With the above and numerous other objects in view, asv will appear asthe description proceeds, the invention resides in certain novelfeatures of construction, and in the combination and arrangement ofparts, as will be hereinafter more fully described and claimed.

-In the drawing:

Figure 1 is a longitudinal section through the cutter.

Figure 2 is a transverse section therethrough, taken substantiallyon theline 2- 2 of Figure 1, and

Figure 3 is a longitudinal section through the spring.

Referring tothe drawing in detail, it will be seen that 1 designates thecylindrical body of the cutter which has, at its bottom end, aninternally threaded extension 2, for receiving a plug 3. A conicalshaped spring memher 4 has an annular flange 5 on its lower end whichengages between the end of the body 1 and the plug 3, so that the springwill be disposed longitudinally through the body. This spring member 4has downwardly tapered slits 7 formed therein, to provide spring arms 8,the upper extremities of which are slotted longitudinally'as at 9. Theexter nal diameter of the cylindrical body 1 is slightly enlarged, as at10, and has flattened faces 11 formed thereon, with openings 12 exof therod, the same is reduced to provide'a tending inwardly therefrom andradiating from the axis of the body. .Ot-her openings 13 extend throughthe body in substantially the same plane with the openings 12 and arediametrically opposed to each other and are.

' so disposed that a linedrawn through the center of the opening 13would be at right angles to a line drawn through the center of theopenings 12. Holders 14 and 15 are disposed in the openings 12 and 13respectively, and have extending from their inner ends T- shapedprojections 16, which are receivable in the slots 9, as is indicated toadvantage in Figures 1 and 2 and the arms 8 of the spring member 4 areso tensioned as to relieve the 5 holders 14 and 15,inwardly of theirrespective openings 12 and 13. The holders 14 receive cutters 17 whilethe holders 15 receive rollers 18, which are journaled therein in anysuitable manner.

A tube 20 is threadably engaged-with the upper end of the cylindricalbody 1, as at 21, and the interior thereof is formed with an annularshoulder 22, adjacent the connection 21. A plunger 23 is provided withopenings 24 therein, and also with suitable packing 25. A rod 26 has itsupper end reduced to pierce the plunger 23, being held in engagementtherewith by nuts 27. Intermediate the ends conic-a1 wedge portion 27,which terminates in the guide extension 28, normally disposed betweenthe heads of the .T-shaped extensions 16. v A spring 29 is disposedabout the rod 26, having one endin engagement with the plunger 23,and'the other end in engagement with a shoulder 30, formed at the upperend of the cylindrical body 1 and normally holds the plunger ofi of theseat 22 and the wedge 27 out of engagement with the extensions 16.

From the description as it has thus far progrossed, it will be seen thatif air or water is forced into the uper portion of the tube 20,

the plunger 23 will be moved downwardly,

thereby pushing downwardly on the rod 26,

and when the wedge shaped portion 27 engages the heads of the T-shapedextension 16, the holders 14 and 15 will be pushed outwardly, so thatupon rotation of the tube and cylindrical body, the cutters will engagethe ing upon the lunger 23, there will be slight to use one cutter 17only and no rollers.

in the plunger until the escape of sai fluid through the openings 24plunger has moved downwardly to contact with the shoulder 22. When thisoccurs the flow of fluid through the openings will be cut oil, and thefact will be indicated at once by its action upon the pumps at thesurface; thus, showing theoperator that the cutting operation has beenfinished and the cutters fully extended. The rollers 18 will act asguides and prevent chatterin When t e plunger is no longer being forceddownwardly, the spring 29 will raise it and the stem 26 so that thesprin 4 may return the holders 14' and 15 inwar 1y of their respectiveopenings 12 and 13. To remove the holders it is only necessary to removethe plunger 3 and Jthe spring 14 will drop out through the bottom end ofthe body 1 thereby disengaging the slotted end 9 of the arms 8 fromtheT-shaped extensions on the holders.

It will be apparent that difl'erentarrangements may be provided in thecutters 17 and 18 and at times some of these elements may be left out.The number of theelements, therefore may be increased or decreased, asmay be found desirable. In constructing the cutters in small sizes, itwould be preferable will thus be apparent that numerous other changes inthe details of construction, and in .the combination and arrangement ofpartsmay be resorted to, without departing from the spirit or scope ofthe'invention as hereinafter claimed, or sacrificing any of itsadvantages.

Having thus described I claim as new is:

I 1. An inside casing cutter including, in combination, a bod havingradially disposed openings, holders in the openings, T-shaped extensionsonthe inner ends of theholders, a cone-shaped spring member in the bodyhav- .ing longitudinally extending slits .starting from its apex andterminating a distance from its base end soas to form a plurality ofspring arms'having slots in theirupper ends for receiving'said T-shapedextensions and normally retaining the holders inwardly of the body, andmeans for spreading the arms and movingthe holders outwardly of thebody.

2. An inside casing cutter including, in

- combination, a body having radially disposed openings, holders in theopeni ,T-shaped its base end seas to form a p urality of spring arms hav slots in their 'upperends' for rece1v1ng sai T-shaped extens ons andnormal- 3 l f v h close said openings w en said plunger is desaidcutters, a fluid p ly retaining the holders inwardly of the body, meansfor spreading the arms and moving the holders outwardly of the body,said. spring member being provided with an outwardly projecting flangeat its bottom end, said body having a shoulder, and a plug threaded inthe end of the body for holding said flange against .said shoulder.

3.; A pipe. cutter comprising a tubular body having a fluid passagetherethrough, cutters movable laterally from said body, a memberco-operating with said cutters to .move the same, a plunger on sa1dmember, a spring on said member between said plunger and said.

- ters adapted to move radially froinjsai body,

a member above said cutters and adapted to be moved downwardly betwensaid cutters to expand said cutters outwardly, a plunger on said member,a spring on said member above said-cutters, and acting to holdsaidplunger normally raised, there being a fluid passage through said body,and means to close sa1d passage when said plunger is depressedtocompletely expand said cutters.

5. A pipe cutter comprising a bod cutters adapted to move laterally fromsaid body, an expanding member above said cutters and adapted to bemoved downwardly between said cutters to expand said cutters outwardly,

a plunger on said member, said plunger having openings therein, means tohold, sa1d plunger resiliently u ward, and means to pressed tocompletely expand said cutters. 6. A pipe cutter including a body havinga fluid passage therethrough, cutters therein,

a member shaped to on age andrmove said cutters outwardly, flui pressureoperated means on said-member, a shoulder on saidbody above saidcutters, said means bein adapted to engage said shoulder, when sai meansis depressed to expand said cutters and to close 01fv the passage offluid, and resilient means engaging said fluid pressure operated meansto hold said member normally raised.

7. YA casing-cutter comprising in combination a body member, extensiblecutters carried by said, body, a plunger for o eratingsaid cutters, afluid passage throu h. said body member, and 06-0 erating means carriedby said body and sai plunger to close said passage when 'said plungerhas extended said cutters.

8; A casing cutter comprising in combination a body member,exte'nsible'cutterscarried by said body, a

- z roughsaidbedy 115:; for operating member, and co-operating meanscarried by said body and said plunger to close said passage when saidcutters are fully extended, said co-operating means being above saidcutters.

9. A device of the character described in-.

cluding a body member, cutters adapted to gefrojected and withdrawnradially of said 0 means slidable in said body to actuate said cutters,a piston carried by said means, a fluid passage thru said body memberand said piston, and additional means formed on said body adapted tocontact said piston to completely stop the flow of fluid thru saidpassage when said piston has extended said cutters.

10. A device of the character described includinga body member, cuttersadapted to be rojected and withdrawn radially of said ody, meansslidable in said body to actuate said cutters, a piston carried by saidmeans,

a fluid passage thru said body and said piston,

additional means adapted to contact said piston to completely shut ofi'the flow of fluid thru said passage when the said piston has extendedsaid cutters and a spring normally tending to separate said piston andsaid additional means.

In testimony whereof I aflix my signature.

7 ERCOLE VENTRESCA.

